I have no idea what these 8 buffers do. They seem to be totally random. And passthrough/video stream are even more confusing and don't seem to do anything at all.

I have a project that draws from a handful of source videos that are patched into a ImageMashup, then into SphericalProjection. I'm trying to automate a fade-in SphericalProjection but I can't get it to work for the life of me.

First of all, the alpha channel in SphericalProjection doesn't even work right or this wouldn't even be an issue. Anyways I've sent the ImageMashup video to a buffer, and tried to pass through spherical projection to the buffer blender but it doesn't work that way either. Passthrough is always just black. Also, for some reason the buffer blender's buffers just seem to be all the source videos I've used, and not the ImageMashup buffer I've created.